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I think they're intended to remind you of arrays/lists, since you're doing an operation over one. I guess when it comes to syntax, beauty is very much in the eye of the beholder - there is a method form of reduce that you can call on an array too, BTW.:-)

Given that I was shocked already, the points put forward by davegaramond remind me that things could be worse, and your own point, my hate probably will most dissipate. I will need to try harder to disassociate square brackets abuse on some mailing lists.